Toward a low-cost high-voltage sodium aqueous rechargeable battery
Volume 29, Issue , Page 26–36
| Sung Joo Kim, Donghee Chang, Jinsoo Kim, Sehwan Moon, Kyungbae Oh, Kyu-Young Park, Won Mo Seong, Hyeokjun Park, Giyun Kwon, Byungju Lee, Kisuk Kang
Abstract: Recent discovery of high-concentration electrolyte systems has opened a new avenue toward the high-voltage, safe, and low-cost aqueous rechargeable batteries . However, the need for generally high-cost organic solutes in the high-concentration electrolyte has become another major obstacle. Herein, we revisited all the commonly used low-cost solutes for high-concentration system and discovered that the use of NaClO4 solute effectively results in a wide electrochemical stability window by suppressing water decomposition and induces stable solid-electrolyte interphase (SEI) layer formation without involving the reduction of salt anions . The SEI layer, composed of Na2 CO3 and NaO compounds including NaOH, guarantees the excellent electrochemical storage stability of the full-cell composed of Na4 Fe3 (PO4 )2 (P2 O7 ) cathode and NaTi2 (PO4 )3 anode for the extended period of time. This new class of electrolyte systems provides remarkable cycle stability and a coulombic efficiency of ∼99% at 1C for over 200 cycles, which outperforms the state-of-the-art super-concentrated systems based on NaCF3 SO3 .
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DOI: 10.1016/j.mattod.2019.02.004
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